In 2013, LEGO released 3 Architecture Landmark Series sets, all of these sets have been retired. For that year, the total price of all retail sets cost $160, today those sets are valued around $1,295, a growth of 710%.
Most valuable 2013 LEGO Architecture Landmark Series set
21021 Marina Bay Sands $980.43
Most owned 2013 Architecture Landmark Series set
21015 The Leaning Tower of Pisa
3 sets

21015 The Leaning Tower of Pisa

Theme / Subtheme Architecture / Landmark Series
Year 2013
Pieces 345
Availability Retired
21015 LEGO Architecture The Leaning Tower of Pisa
Retail $34.99
Value $154.48
Growth  +341.5%
Annual growth 8.6%

21018 United Nations Headquarters

Theme / Subtheme Architecture / Landmark Series
Year 2013
Pieces 597
Availability Retired
21018 LEGO Architecture United Nations Headquarters
Retail $49.99
Value $160.37
Growth  +220.8%
Annual growth 8.6%

21021 Marina Bay Sands

Theme / Subtheme Architecture / Landmark Series
Year 2013
Pieces 602
Availability Retired
21021 LEGO Architecture Marina Bay Sands
Retail $74.99
Value $980.43
Growth  +1207.4%
Annual growth 10.2%